#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
int main()
{
    pid_t id = fork();
    if(id == 0)
    {
        //child
        while(1)
        {
            printf("子进程运行...,pid:%d, ppid:%d\n", getpid(), getppid());
            sleep(1);
        }
    }
    else
    {
        //papa
        //int cnt = 5;
        while(1)
        { 
            printf("父进程运行...,pid:%d, ppid:%d\n", getpid(), getppid());
            sleep(1);
        }
    }
    return 0;
}
